Hi thanks for the reply. I've taken a few pictures to see if this helps. I'm not 100% sure but it looks to me that the chain is not sitting in the teeth of the ring quite right. Could you let me know you thoughts
pictures

Ok so the chain has been replaced, new? If it is be warned there are different size chains for different speeds of bikes. So if the chain you put on is for lets say 10speed (5gears in rear, 2 up front)and you have a 21 speed then that will not work. And vice versa. How many cogs you have in the rear? We see that you have 3 in the front. How the terminology works is if you have a 21speed then many people refer to the back as being 7spd (speed).

Good maintenance to your Bike, can make it like the wheels are, true and smooth!

You will definitely need a crank puller. Picture of the middle part on the crank would help out to make sure on that. The rings, well if you could also take a picture of them on the other side we could see if they are replaceable.

Good maintenance to your Bike, can make it like the wheels are, true and smooth!

Your chain is stretched and your sprockets worn. Looking at the wear IMO you should replace all three, chain front crank and rear cluster.
AS per how too see the repair guide on top of the page, and view one of Alex's videos......

(11-12-2012, 02:09 PM)MARK170881 Wrote: I'll also post a picture of the rear cluster tonight and could you let me know if you also think these will need replacing

Based on the condition of your old chain, I would say it is almost certain that your rear cluster needs to be changed. In fact, I think it's far more likely that it is the rear cluster mainly causing the skipping than the front chainrings.

This is what a good set of chainrings should look like. Note the narrow valleys and wide teeth with rounded tips.

We have no information regarding your bike. More chainring photos will not help. The granny gear may be still be OK. AS I said before judging from wear you should replace entire drive train. Chain alone will not fix it. Is it road or mt bike , is it freewheel or cassette?

Yes that looks like a freewheel and you need special tools for removal. See repair guide above. I can see grease in there so servicing has been done. But you still need to replace it along with rest of the drive. Take your time to go through all the bearings, wheels, bottom bracket. (may be a good time to put in a Shimano UN54 sealed BB) and head. Likewise cables, shifters etc. I like waterproof marine grease used for boat trailers and automotive bearings. Something to keep you busy over winter.:-)

Looks like you got lots of good use out of this bike and refreshing it will give you lots more good years.

Think they'll be alright I've gone for budget ones due to the miles I do/terrain

I would like to say I've got a good use out of it but I bought it on the 'cheap' for £40. I've had to buy a 'cheapy' bike while I get this one repaired but your quite right will keep me very busy sorting it out

They look fine, budget ones are just heavier and less shiny, mostly. The chain rings even have a chain guard. Good prices. As I recommended before check your bottom bracket if smooth just clean replace bearings and grease. Otherwise check out the Shimano UN54 or like sealed BB. Good luck you are well on the way...